The person presenting an argument is attacked instead of the argument itself. This takes many forms. For example, the person's character, nationality or religion may be attacked. Alternatively, it may be pointed out that a person stands to gain from a favourable outcome. Or, finally, a person may be attacked by association, or by the company he keeps.

There are three major forms of Attacking the Person:
1. ad hominem (abusive): instead of attacking an assertion, the argument attacks the person who made the assertion.
2. ad hominem (circumstantial): instead of attacking an assertion the author points to the relationship between the person making the assertion and the person's circumstances.
2. ad hominem (tu quoque): this form of attack on the person notes that a person does not practise what he
preaches.